Improvement in hair-spring adjustment for watches



@nicht @titi-rr.

AUGUSTUS BROWN, 0F DRYDEN, NEW YORK.

Letters Patent No. 98,024, dated December 21, 1869.

IMPROVEMENT IN HAIR-SPRING- ADJUSTMENT FOR WATCHES.

The Schedule referred to in these Letters Patent and making part of the s ame To all whom it may concern Be it known that I, AUGUSTUS BROWN, of Dryden, in the county of Tompkins, and State of New York, have invented a new and useful Improvement in W'atches; andl do hereby declare that the following is a full, clear, and exact description thereof', which will enable others skilled in the art to make and use the same,.refer ence being had to the accompanying drawing, forming part of this specification.

This invention relates to new and useful improvements in watches, and has particular reference to the method of regulating theni, or of operating on the hair-spring, so as to make them run faster or slower; and

, lt consists in the 'manner in which the end of the hair-spring is secured to the stud, and in an adjustable regulater-attachment,-whereby the hair-spring is left in its natural unrestrained position, and whereby the convolutions of the spring are in nowisedistorted. in

turning. the regulator', thereby `allowing of a much^ taiued by the common method, as will be hereinafter more fully described. I

In the accompanying plate of drawings- Figure l represents a top orplan view of a, watchbalance wheel and hair-spring with my improvements attached;

Figure 2 is a side view', showing the method of securing the hair-spring to the stud;

Figure 3 represents the hair-spring stud; and

Figure 4 is a clamp, which is used in connection with the stud. l

Similar letters of reference 4indicate corresponding parts, I'

' a is the balance-wheel;

b is the hair-spring;

c is the .hair-springstud;

d is the clamp;

.e is'the regulator; and

f isthe regulatopattachment.

The ordinarymethod of fastening the hairspring to the stud is to pass itsv end through av hole in the end of the stud, and to secure it with a pin, the hole through the stud being large enough to admit both spring and pin. For the purpose of leaving the hairspring free, and in a natural positon, I clamp it "between the double serrated ends g got' the stud and clamp, and for the purpose of keeping the spring in its proper position, (vertically,) or to prevent its tipping, I curve the end, as seen in the dotted lines at h. By fastening the spring in this manner, it is kept in its natural position at all times.

The attachment f, to which the regulator-curb pins are'attached, is adjustable on the regulator.

Itis held in position by the friction produced by the fastening-rivet t. o

The outer convolutions of the hair-spring coil pass between these'curb-pius in thc ordinary manner, but they can be so adjusted by this arrangement as to conform tothe position of the spring when moved for regulating the watch.

By' the ordinary method of regulating, the hairspring is vdrawn from its natural posit-ion or distorted by the curb-pins. By my method, the spring remains in itsnatural position, the process of regulating being merely a shortening or lengthening of the spring.

When the regulator is once properly adjusted, the movement retains its beat and isochronism, and therefore the motion of the balance-wheel is always free, easy, and uniform.

1t will thus be seen that the outer end ot' the hairspring is secured in its natural position without any intlueuces operating to distort it, and that by the curved regulator-attachment f, the curb-pinsare adjusted to suit the outer convolutions ofthe hair-spring, so that when the spring is at rest there is no pressure upon it from either of the curb-pins.

Having thus described my invention,

l claim as new, as far as itis now perfectedl. The method of securing. the outer end of the hair-spring by means of the clamp c d pressing upon the edges of said spring, substantially as described.

2. rlhe adjustable link f to the regulator, whereby the curb-pins are adjusted to the position of the outer convolution of the hair-spring, substantially as'and for the purpose set forth.

The above specification of my invention signed by me, this 24th day of November, 1868.-

AUGUSTUS BRQWN. Witnesses:

FRANK BLooKLnr, ALEX. F. ROBERTS. 

